@book { KrankenhausundEGBeihilferecht,
    title = "Krankenhaus und EG-Beihilferecht",
    author = "Axel {Lehmann}",
    year = "2008",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1105177"
}